飞机的推力由螺旋桨所产生。
The thrust force of an airplane is produced by the propeller.
该螺旋桨不仅有利于提高船舶推进系统的效率，而且能产生较大推力。
The propeller is not only favorable to enhance the efficiency of marine propulsion systems, but also can generate large pushing force.
这个游泳助推器就是用腿、脚的蹬力带动螺旋桨旋转，产生较大的推力。
The booster for swimming is characterized in that the propeller is driven to rotate by utilizing pedaling force of legs and feet. Thus, the great thrust is generated.
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